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Show-through cancellation in scans of duplex printed documents
1Digital Imaging Technol. Center, Xerox Corp., Webster, NY 14580, USA. g.sharma@ieee.org
Summary
Scanning double-sided documents can result in unwanted show-through from the back page. This study presents a new adaptive filtering method to electronically remove this artifact, improving scan quality.
Area of Science:
- Digital Imaging
- Image Processing
- Document Digitization
Background:
- Scanning double-sided documents often results in "show-through" artifacts where the reverse side's print is visible on the scan of the front side.
- This phenomenon occurs due to the incomplete opacity of paper, degrading the quality of digitized documents.
Purpose of the Study:
- To analyze the physical principles behind the show-through phenomenon in scanned documents.
- To develop an effective electronic method for removing show-through artifacts from scanned pages.
Main Methods:
- Physical principles were used to derive a simplified mathematical model of show-through.
- The model was linearized through transformations and approximations.
- An adaptive linear filtering scheme was developed based on the linearized model, utilizing scans of both document sides.
Main Results:
- A linearized mathematical model accurately represents the show-through phenomenon.
- The developed adaptive linear filtering scheme effectively removes show-through artifacts.
- Experimental results confirm the method's efficacy in enhancing scanned document quality.
Conclusions:
- The proposed method provides an effective electronic solution for removing show-through from scanned documents.
- This technique significantly improves the visual quality and readability of digitized double-sided printed materials.
